Triathlons are unlocked after completing any mission from Mary-Ann. There are a total of THREE Triathlons to complete and you'll need to complete the first triathlon to unlock the next one.

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Any of the three characters can participate in the triathlon and there are no prerequisites, though it is recommended that you have have Max Stamina in order to get through each race. The races can be done during the day or at night, so approach the young man at the triathlon location and sign up!

The first triathlon race is located just near the Los Santos Airport near LS Customs. For the race, you'll be swimming towards Vespucci Beach followed by a bike and foot race through the Vespucci Beach streets. When the race begins, you should be able to get within the top of the gang during the swim as long as you don't stop.

As you exit the water, run towards the FRONT of the bike path and reach the first bike up in front. Also, it's OKAY to bump off your fellow competitors by running into them, which makes them fall and gives you the advantage to reach your bike up in front. Pedal quickly but keep watch of your speed since the boardwalk is twisty.

At the end of the bike path, start running down the hill. Stay on the path and you should win easily.

The triathlon in Sandy Shores is unlocked once you complete the Vespucci Beach race. And like the first race, the race is almost identical so winning should be easy with any character.

Remember to run to the front of the bike path when getting on a bike (and bump off any other competitors) and pedal quickly! The Sandy Shores streets aren't as twisty as Vespucci Beach so navigating shouldn't be difficult.

There are only a few checkpoint during the running section, so gun it and you should win this triathlon easily.

This monster triathlon is unlocked after completing the Sandy Shores race and is the lengthiest of the three. Each section of the race is nearly ten minutes in length (nearly 30 minutes of racing) and spans from Sandy Shores to Los Santos to Vespucci Beach.

Switch to Trevor for this Triathlon. At Max Stamina and Strength, Trevor can outswim, bike, and outrun the competition (assuming your thumbs don't quit during the race) better than Michael or Franklin.

Use as many shortcuts as possible. There are several areas throughout the competition where you can get to the next checkpoint by biking over certain terrains such as the Maze Bank Arena (where you can bike over the dirt road to the next checkpoint and gain a significant lead).

Don't be afraid to bump off your opponents. There will be several times during the competition where your opponents will have super strength and catch up to you, so when they get close just bump into them to make them slow down.

If you are in first place by the time you get to the Running section of the competition, you SHOULD be able to maintain your running speed and complete the Triathlon in first place.